2、、定语等成分。关系代词在定语从句中作主语时,从句谓语动词的人称和数要和先行词保持一致。1、who,whom,that限定性定语从句中的关系代词作主语作宾语 作定语指人who/thatwhom/that(可省略)whose指物which/thatwhich/that(可省略)whose指人和物 that that whose非限定性定语从句中的关系代词作主语 作宾语 作定语指人who whom whose/ofwhom指物 which whichwhose/ofwhich特殊情况只能用that的情况先行词为everything,all,little,much